Seoul apartment monthly rents surged 15.1% year-on-year to average 1.661 million Korean won by September 2026, driven by tightening regulations that squeezed the traditional jeonse lump-sum deposit market. As government policies restricted non-resident landlords and shrunk available listings, tenants faced cost pressures across the South Korean capital.
The latest housing price trends released by the Korea Real Estate Board show that the capital’s rental market is undergoing a structural shift. The average monthly rent climbed from 1.443 million Korean won in September 2025 to 1.661 million Korean won a year later, outpacing both apartment sales price increases of 10.4% and jeonse price growth of 10.7% over the same period.
Regulatory Shifts and Shrinking Jeonse Supply
For decades, the unique jeonse system—where tenants pay a massive lump-sum deposit instead of monthly rent—served as the cornerstone of South Korean housing finance. But recent government interventions have sharply curtailed this market. Following the expansion of land transaction permit zones across Seoul in October 2025, buyers of jeonse-encumbered properties faced mandatory actual residency requirements.
Announcements regarding strengthened taxes on non-resident single-homeowners further evaporated listings. With housing demand in Seoul remaining high, tenants unable to secure shrinking jeonse properties found themselves pushed directly into the monthly rent market.
Data from the Korea Real Estate Board underscores this rapid transition. Between January and September 2026, 52.7% of all apartment rental transactions in Seoul were monthly rent arrangements, marking a 7.7 percentage point increase from 44.4% in 2025. This trajectory puts the market on course to see monthly rent transactions surpass jeonse transactions for the first time this year.
District-Level Pressures and Deposit Stagnation
The crunch is distributed unevenly across Seoul’s 25 districts, with outward and mid-tier residential areas posting the steepest spikes. Five districts—Gwangjin, Songpa, Yeongdeungpo, Gangdong, and Seongbuk—recorded average monthly rent increases exceeding 20% between September 2025 and September 2026. Conversely, Gangnam-gu posted a more modest single-digit rise of 5.5%.
| District | Monthly Rent Increase (2025–2026) | Average Jeonse Price Change (Two-Year Span) |
|---|---|---|
| Songpa-gu | 22.4% | Up 24.3% (to 941.37 million won) |
| Gangdong-gu | 21.8% | Up 20.6% (to 603.75 million won) |
| Yeongdeungpo-gu | 22.5% | Up 18.3% (to 643.26 million won) |
| Seongbuk-gu | 20.1% | Up 18.7% (to 532.63 million won) |
While monthly rents climbed rapidly, average deposits remained relatively stable, moving only slightly from 194.45 million Korean won to 195.68 million Korean won. This stability stems from the growing prevalence of semi-jeonse contracts, where landlords maintain baseline deposits while adding monthly rent.
Renewed lease data highlights the human toll of this adjustment. From January to September 2026, 3,285 cases saw expiring jeonse agreements converted into monthly rent configurations—an 8.8% increase over the same timeframe in the previous year.
Vulnerabilities in the Non-Apartment Sector
While apartment tenants face stiff adjustments, low-income households and young adults relying on the non-apartment market—including single-family homes, multi-family units, and row houses—face an even steeper barrier to housing stability.
Government figures indicate that the monthly rent ratio for non-apartments in Seoul reached 78.2% between January and September 2026. As regulatory pressure continues to reshape lease structures across South Korea, market analysts emphasize that the era of traditional lump-sum tenancy is receding, leaving renters to absorb ongoing cost volatility in the monthly cash market.
